diff --git a/core/src/main/scala/com/avsystem/commons/misc/Delegation.scala b/core/src/main/scala/com/avsystem/commons/misc/Delegation.scala
index 9023eeee2..765b5c932 100644
--- a/core/src/main/scala/com/avsystem/commons/misc/Delegation.scala
+++ b/core/src/main/scala/com/avsystem/commons/misc/Delegation.scala
@@ -2,11 +2,23 @@ package com.avsystem.commons
 package misc
 
 /** A typeclass which witnesses that type `A` can be wrapped into trait or abstract class `B`
+  *
+  * @deprecated
+  *   `Delegation` is being removed in the Scala 3 release of scala-commons. The blackbox macros have no Scala 3
+  *   counterpart; write the delegating wrapper manually (`new TargetTrait { def x = source.x; ... }`).
   */
+@deprecated(
+  "Delegation will be removed in the Scala 3 release of scala-commons. Write the delegating wrapper manually.",
+  since = "2.29.0",
+)
 trait Delegation[A, B] {
   def delegate(a: A): B
 }
 
+@deprecated(
+  "Delegation will be removed in the Scala 3 release of scala-commons. Write the delegating wrapper manually.",
+  since = "2.29.0",
+)
 object Delegation {
   implicit def materializeDelegation[A, B]: Delegation[A, B] =
     macro com.avsystem.commons.macros.misc.DelegationMacros.materializeDelegation[A, B]